Hopen says the teenager and his friend were in an area of the park they shouldn’t have been, out on the rocks near a cliff, when he slipped and tumbled, and a tree broke his fall.

Hopen says the teenager sustained cuts and bruises and was alert and responsive when he was flown to a St. Louis hospital for evaluation.
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Information from: St. Louis Post-Dispatch, http://www.stltoday.com